xxviii EDITOR'S PREFACE. 



species I have referred to such authors as have noticed the 

 occurrence of these additional species in Southern Africa. I 

 have alsOj in all cases, referred to those authors who have re- 

 corded the occurrence of any of the birds here mentioned in the 

 countries to which the present volume refers, and occasionally to 

 other authors whose works elucidate questions of interest as to 

 the synonymy or economy of various species referred to in the 

 following pages. 



I have also given a reference to a figure of each species in all 

 cases where it was known to me that the species had been figured. 



It may be right to add that certain extracts from Mr. 

 Andersson^s ornithological notes have been already published, 

 some having been contributed by Mr. Andersson to the ornitho- 

 logical appendix to Chapman^s ' Travels in South Africa/ and 

 others to the 'Proceedings of the Zoological Society' for 1864; 

 but this circumstance, it is apprehended, does not materially 

 diminish the desirableness of preserving in a more complete form 

 the record of the personal observations of so eminent a traveller 

 and so persevering an ornithologist as the late Mr. Andersson 

 unquestionably was. 



At the commencement of this volume will be found a map of 

 Damara Land and the countries adjacent; and at its close a scale 

 of British inches and lines, which latter may be useful to any 

 continental naturalists who have occasion to refer to Mr. 

 Andersson's measurements; also lithographs of the sternum 

 and larynx of MachcEramphus Anderssoni from Mr. Andersson's 

 original drawings. These lithographs are not referred to in 

 the article on this very iateresting bird of prey, as the original 

 drawings had been accidentally mislaid, and were not found 

 again until after that article had been printed. 



A list of the various works referred to in this volume will be 

 found at the end of this preface, as it is thought that this may 

 prove convenient to readers desirous of consulting any of these 

 authorities. 



